The only difference between this lab and CBWFQ is making it LLQ. I would not do these one after the other, intersperse another lab, or do CBWFQ and then change it to LLQ.

To prepare for this lab only turn on one 800K link between R1 and R2, and the link between R4 and R1 for traffic generation. If you want traffic to make it around the lab then configure to your hearts content.